http://www.w3.org/Bugs/Public/show_bug.cgi?id=2057
Summary: R-068: Contradiction in Structures re: base for
complexTypes with simpleContent
Product: XML Schema
Version: 1.0
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: XSD Part 1: Structures
AssignedTo: ht@w3.org
ReportedBy: sandygao@ca.ibm.com
QAContact: www-xml-schema-comments@w3.org
There appears to be a contradiction in Structures as to whether a complexType
with simpleContent is allowed to be derived by restriction from a mixed type.
The property mapping rules for complex type with simple content state the
following for content type when restriction is chosen:
"1 if the type definition resolved to by the actual value of the base
[attribute] is a complex type definition (whose own {content type} must be a
simple type definition, see below) and the restriction alternative is
chosen ...".
In addition, Schema Representation Constraint: Complex Type Definition
Representation OK states:
"If the <simpleContent> alternative is chosen, the type definition resolved to
by the actual value of the base [attribute] must be either a complex type
definition whose {content type} is a simple type definition or, only if the
<extension> alternative is also chosen, a simple type definition; "
However, "Schema Component Constraint: Derivation Valid (Restriction, Complex)"
states:
"5.1 If the {content type} of the complex type definition is a simple type
definition, then one of the following must be true:
5.1.1 The {content type} of the {base type definition} must be a simple type
definition of which the {content type} is a valid restriction as defined in
Derivation Valid (Restriction, Simple).
5.1.2 The {base type definition} must be mixed and have a particle which is
emptiable as defined in Particle Emptiable). "
See: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2001Jun/0047.html